Is this statement always, sometimes, or never true?If ∠V is an angle in a right triangle and m∠V is less than 40°, then cos(V)=sin(V).
Question
Is this statement always, sometimes, or never true?If ∠V is an angle in a right triangle and m∠V is less than 40°, then cos(V)=sin(V).
Solution
This statement is never true. Here's why:
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In a right triangle, the two non-right angles are complementary, meaning they add up to 90 degrees.
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The sine of an angle in a right triangle is defined as the length of the opposite side divided by the length of the hypotenuse. The cosine of an angle is defined as the length of the adjacent side divided by the length of the hypotenuse.
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If ∠V is less than 40°, then the other non-right angle in the triangle is greater than 50° (since they must add up to 90°).
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The sine of an angle increases as the angle increases from 0° to 90°, while the cosine of an angle decreases as the angle increases from 0° to 90°. Therefore, sin(∠V) would be less than cos(∠V) if ∠V is less than 40°.
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Therefore, cos(V) cannot equal sin(V) if ∠V is less than 40° in a right triangle.
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